Book Image

Progressive Web Application Development by Example

By : Chris Love
Book Image

Progressive Web Application Development by Example

By: Chris Love

Overview of this book

Are you a developer that wants to create truly cross-platform user experiences with a minimal footprint, free of store restrictions and features customers want? Then you need to get to grips with Progressive Web Applications (PWAs), a perfect amalgamation of web and mobile applications with a blazing-fast response time. Progressive Web Application Development by Example helps you explore concepts of the PWA development by enabling you to develop three projects, starting with a 2048 game. In this game, you will review parts of a web manifest file and understand how a browser uses properties to define the home screen experience. You will then move on to learning how to develop and use a podcast client and be introduced to service workers. The application will demonstrate how service workers are registered and updated. In addition to this, you will review a caching API so that you have a firm understanding of how to use the cache within a service worker, and you'll discover core caching strategies and how to code them within a service worker. Finally, you will study how to build a tickets application, wherein you’ll apply advanced service worker techniques, such as cache invalidation. Also, you'll learn about tools you can use to validate your applications and scaffold them for quality and consistency. By the end of the book, you will have walked through browser developer tools, node modules, and online tools for creating high-quality PWAs.
Table of Contents (12 chapters)

Service worker events

There are two types of service worker events: core and functional. Core messages are fundamental to what makes a service worker a service worker. Functional events can be thought of as extensions to the central service worker backbone:

Core Events:

  • Install
  • Activate
  • Message

Functional Events:

  • fetch
  • sync
  • push

Each of these events can be used to trigger processing. The install and activate events are part of the life cycle. In Chapter 7, Service Worker Caching Patterns, we will dive into different caching patterns. The install and activate events are very useful to manage pre-caching assets and cleaning up your cache model.

When a new service worker is registered, the install event immediately triggers. The activate event triggers when the service worker becomes active. This means that any existing service worker is replaced with the new service worker.